linkedList.nim
proc `[]`*(self: LinkedList, index: var int): int =
    if (index < 0 or index > self.len - 1) :
        return -1
    var sup = self.head
    while (index != 0) :
        sup = sup.next
        index -= 1
    return sup.valor

main.nim
import linkedList

var lista: LinkedList = newLinkedList()
discard lista += 0
discard lista += 1
discard lista += 2
discard lista += 3
discard lista += 4
discard lista += 5
echo lista[0]